Publish a self-contained binary package of wlmaker at head

[phkaeser]

Leftover part of #3 and of #4:

To permit users to easily get hold of the most recent wlmaker version and test it: Have a binary release packaged, together with the dependencies at the required versions.
(thinking: eg. a flatpak? snap? better ideas?)

[probonopd]

AppImage :)

Actually I had started working on it but am no more active there due to the CLA and Google Account requirement. But you are welcome to take what you deem useful. Probably further tinkering is needed.

https://github.com/probonopd/wlmaker/blob/deploy/.github/workflows/build_and_upload_artifact.yml

[alexmyczko]

there is also https://pkgx.sh but really native packages are best, and you cover most with .deb and .rpm...